My old 2008 Black Macbook has finally died. The LCD screen will not turn on, and requires me to hook up an external monitor. I am thinking about upgrading to the new i5 Macbook Air, but worried the process is slower then my old computer. I understand this may be a dumb question, but hoping someone with more knowledge in processor speed can help me out. What is the difference between: 2.4GHz Intel Core 2 Duo (Early 2008 Macbook) vs. 2013 i5 MBA? Thanks!